This comic was notable because it featured the first appearance of Superman and it ushered in the Golden Age of superhero comics back in 1938. Before this comic, there were no superheroes as we think of them today. Well, that copy of Action Comics was sold for $317,200. Not bad for an initial 35 cent investment, right?

While Action Comics #1 began what is considered the Golden Age of Comics, Showcase #4 and Flash’s first appearance started what is considered the Silver Age of Comics. The Flash seen here is an update of the Golden Age Flash, modernized for the Space Age. This comic led to a revival of other Golden Age heroes like Green Lantern who appeared 18 issues later in Showcase #22. This updating of decades old heroes led to a revival in the popularity of the superhero comic after several years of sagging interest.

The auction for Showcase #4 ended 9 days ago and the final bid was almost $180,000, making this comic the most expensive Silver Age Comic in existence. Yay, Flash!!